<?php

if ( ! function_exists('myTest'))
{
    function myTest() {
        return 'myTest_helper';
    }
}
if (! function_exists('is_pjax'))
{
    function is_pjax(){
        return array_key_exists('HTTP_X_PJAX', $_SERVER)
        && $_SERVER['HTTP_X_PJAX'] === 'true';
    }
}

/**
 *Utf-8、gb2312都支持的汉字截取函数
 *cut_str(字符串, 截取长度, 开始长度, 编码);
 *编码默认为 utf-8
 *开始长度默认为 0
 */
if ( ! function_exists('cut_str'))
{
    function cut_str($string, $sublen, $start = 0, $code = 'UTF-8')
    {
        if($code == 'UTF-8')
        {
            $pa = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|\xe0[\xa0-\xbf][\x80-\xbf]|[\xe1-\xef][\x80-\xbf][\x80-\xbf]|\xf0[\x90-\xbf][\x80-\xbf][\x80-\xbf]|[\xf1-\xf7][\x80-\xbf][\x80-\xbf][\x80-\xbf]/";
            preg_match_all($pa, $string, $t_string);

            if(count($t_string[0]) - $start > $sublen) return join('', array_slice($t_string[0], $start, $sublen))."...";
            return join('', array_slice($t_string[0], $start, $sublen));
        }
        else
        {
            $start = $start*2;
            $sublen = $sublen*2;
            $strlen = strlen($string);
            $tmpstr = '';

            for($i=0; $i< $strlen; $i++)
            {
                if($i>=$start && $i< ($start+$sublen))
                {
                    if(ord(substr($string, $i, 1))>129)
                    {
                        $tmpstr.= substr($string, $i, 2);
                    }
                    else
                    {
                        $tmpstr.= substr($string, $i, 1);
                    }
                }
                if(ord(substr($string, $i, 1))>129) $i++;
            }
            if(strlen($tmpstr)< $strlen ) $tmpstr.= "...";
            return $tmpstr;
        }
    }
}

/**
 * Get either a Gravatar URL or complete image tag for a specified email address.
 *
 * @param string $email The email address
 * @param string $s Size in pixels, defaults to 80px [ 1 - 2048 ]
 * @param string $d Default imageset to use [ 404 | mm | identicon | monsterid | wavatar ]
 * @param string $r Maximum rating (inclusive) [ g | pg | r | x ]
 * @param boole $img True to return a complete IMG tag False for just the URL
 * @param array $atts Optional, additional key/value attributes to include in the IMG tag
 * @return String containing either just a URL or a complete image tag
 * @source http://gravatar.com/site/implement/images/php/
 */
if ( ! function_exists('get_gravatar')) {
    function get_gravatar( $email, $s = 80, $d = 'mm', $r = 'g', $img = false, $atts = array() ) {
        $url = 'http://www.gravatar.com/avatar/';
        $url .= md5( strtolower( trim( $email ) ) );
        $url .= "?s=$s&d=$d&r=$r";
        if ( $img ) {
            $url = '<img src="' . $url . '"';
            foreach ( $atts as $key => $val )
                $url .= ' ' . $key . '="' . $val . '"';
            $url .= ' />';
        }
        return $url;
    }
}